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Implement a caching client pool to save on the initial handshake.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| package gonvif | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/jellydator/ttlcache/v3" | ||
| "golang.org/x/sync/singleflight" | ||
| ) | ||
|
|
||
| type ClientPool interface { | ||
| GetClient(baseURL, username, password string, verbose bool) (Client, error) | ||
| } | ||
|
|
||
| func NewPool(ttl time.Duration) ClientPool { | ||
| cache := ttlcache.New( | ||
| ttlcache.WithTTL[key, Client](ttl), | ||
| ) | ||
| go cache.Start() | ||
|
|
||
| return &pool{ | ||
| cache: cache, | ||
| } | ||
| } | ||
|
|
||
| type key struct { | ||
| baseURL string | ||
| username string | ||
| password string | ||
| verbose bool | ||
| } | ||
|
|
||
| type pool struct { | ||
| cache *ttlcache.Cache[key, Client] | ||
| group singleflight.Group | ||
| } | ||
|
|
||
| func (p *pool) GetClient(baseURL, username, password string, verbose bool) (Client, error) { | ||
| k := key{ | ||
| baseURL: baseURL, | ||
| username: username, | ||
| password: password, | ||
| verbose: verbose, | ||
| } | ||
| item := p.cache.Get(k) | ||
|
|
||
| if item != nil { | ||
| return item.Value(), nil | ||
| } | ||
|
|
||
| return p.newClientSynced(k) | ||
| } | ||
|
|
||
| func (p *pool) newClientSynced(k key) (Client, error) { | ||
| v, err, _ := p.group.Do(k.String(), func() (any, error) { | ||
| return p.newClient(k) | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return v.(Client), nil | ||
| } | ||
|
|
||
| func (p *pool) newClient(k key) (Client, error) { | ||
| client, err := New(k.baseURL, k.username, k.password, k.verbose) | ||
| if err != nil { | ||
| p.cache.Set(k, client, ttlcache.DefaultTTL) | ||
| } | ||
| return client, err | ||
| } | ||
|
|
||
| var escaper = strings.NewReplacer( | ||
| "\\", "\\\\", | ||
| "|", "\\|", | ||
| ) | ||
|
|
||
| func (k key) String() string { | ||
| return fmt.Sprintf("%s|%s|%s|%v", | ||
| escaper.Replace(k.baseURL), | ||
| escaper.Replace(k.password), | ||
| escaper.Replace(k.username), | ||
| k.verbose) | ||
| } |